This read-write Integer32 (1 to 255) specifies the NSAP address selector byte value used to identify MGCP as the owning application when an SVC call setup indication arrives from the network, and cannot be modified while ATM SVC calls are active. An administrator sets this distinct from cvapSvcH248SelectorByteValue so incoming SVC setups are routed to the correct signaling protocol handler. For example, configuring this to a unique byte value ensures MGCP-controlled calls are properly distinguished from H.248-controlled calls arriving on the same NSAP address space.